/***********************************************************************/
/* Functions relatives to tracks, vias and segments used to fill zones */
/* (see class_track.h )                                                */
/***********************************************************************/

#include "fctsys.h"
#include "gr_basic.h"
#include "common.h"
#include "trigo.h"
#include "class_drawpanel.h"
#include "drawtxt.h"

#include "pcbnew.h"
#include "class_board_design_settings.h"
#include "colors_selection.h"
#include "protos.h"


/**
 * Function ShowClearance
 * tests to see if the clearance border is drawn on the given track.
 * @return bool - true if should draw clearance, else false.
 */
static bool ShowClearance( const TRACK* aTrack )
{
    // maybe return true for tracks and vias, not for zone segments
    return DisplayOpt.ShowTrackClearanceMode == SHOW_CLEARANCE_ALWAYS
           &&  aTrack->GetLayer() <= LAST_COPPER_LAYER
           && ( aTrack->Type() == TYPE_TRACK || aTrack->Type() == TYPE_VIA );
}


/**********************************************************/
TRACK::TRACK( BOARD_ITEM* aParent, KICAD_T idtype ) :
    BOARD_CONNECTED_ITEM( aParent, idtype )
/**********************************************************/
{
    m_Width = 0;
    m_Shape = S_SEGMENT;
    start   = end = NULL;
    SetDrillDefault();
    m_Param = 0;
}


/***************************/
wxString TRACK::ShowWidth()
/***************************/
{
    wxString msg;

    valeur_param( m_Width, msg );

    return msg;
}


SEGZONE::SEGZONE( BOARD_ITEM* aParent ) :
    TRACK( aParent, TYPE_ZONE )
{
}


SEGVIA::SEGVIA( BOARD_ITEM* aParent ) :
    TRACK( aParent, TYPE_VIA )
{
}


// Copy constructor
TRACK::TRACK( const TRACK& Source ) :
    BOARD_CONNECTED_ITEM( Source )
{
    m_Shape = Source.m_Shape;
    SetNet( Source.GetNet() );

    m_Flags     = Source.m_Flags;
    m_TimeStamp = Source.m_TimeStamp;
    SetStatus( Source.ReturnStatus() );
    m_Start = Source.m_Start;
    m_End   = Source.m_End;
    m_Width = Source.m_Width;
    m_Drill = Source.m_Drill;
    SetSubNet( Source.GetSubNet() );
    m_Param = Source.m_Param;
}


/*  Because of the way SEGVIA and SEGZONE are derived from TRACK and because there are
 *  virtual functions being used, we can no longer simply copy a TRACK and
 *  expect it to be a via or zone.  We must construct a true SEGVIA or SEGZONE so its constructor
 *  can initialize the virtual function table properly.  This factory type of
 *  function called Copy() can duplicate either a TRACK, SEGVIA, or SEGZONE.
 */
TRACK* TRACK::Copy() const
{
    if( Type() == TYPE_TRACK )
        return new TRACK( *this );

    if( Type() == TYPE_VIA )
        return new SEGVIA( (const SEGVIA &) * this );

    if( Type() == TYPE_ZONE )
        return new SEGZONE( (const SEGZONE &) * this );

    return NULL;    // should never happen
}

/**
 * Function GetClearance (virtual)
 * returns the clearance in internal units.  If \a aItem is not NULL then the
 * returned clearance is the greater of this object's clearance and
 * aItem's clearance.  If \a aItem is NULL, then this objects
 * clearance
 * is returned.
 * @param aItem is another BOARD_CONNECTED_ITEM or NULL
 * @return int - the clearance in internal units.
 */
int TRACK::GetClearance( BOARD_CONNECTED_ITEM* aItem ) const
{
    // Currently tracks have no specific clearance parameter
    // on a per track or per segment basis.
    // the NETCLASS clearance is used
    return BOARD_CONNECTED_ITEM::GetClearance( aItem );
}

/**
 * Function GetDrillValue
 * calculate the drill value for vias (m_Drill if > 0, or default drill value for the Netclass
 * @return real drill_value
 */
int TRACK::GetDrillValue() const
{
    if( Type() != TYPE_VIA )
        return 0;

    if( m_Drill > 0 )      // Use the specific value.
        return m_Drill;

    // Use the default value from the Netclass
    NETCLASS* netclass = GetNetClass();

    if( m_Shape == VIA_MICROVIA )
        return netclass->GetuViaDrill();

    return netclass->GetViaDrill();
}


/***********************/
bool TRACK::IsNull()
/***********************/

// return true if segment length = 0
{
    if( ( Type() != TYPE_VIA ) && ( m_Start == m_End ) )
        return true;
    else
        return false;
}


/*************************************************************/
int TRACK::IsPointOnEnds( const wxPoint& point, int min_dist )
/*************************************************************/

/* Return:
 *  STARTPOINT if point if near (dist = min_dist) star point
 *  ENDPOINT  if point if near (dist = min_dist) end point
 *  STARTPOINT|ENDPOINT  if point if near (dist = min_dist) both ends
 *  0 if no
 *  if min_dist < 0: min_dist = track_width/2
 */
{
    int result = 0;

    if( min_dist < 0 )
        min_dist = m_Width / 2;

    int dx = m_Start.x - point.x;
    int dy = m_Start.y - point.y;

    if( min_dist == 0 )
    {
        if( (dx == 0) && (dy == 0 ) )
            result |= STARTPOINT;
    }
    else
    {
        double dist = ( (double) dx * dx ) + ( (double) dy * dy );
        dist = sqrt( dist );
        if( min_dist >= (int) dist )
            result |= STARTPOINT;
    }

    dx = m_End.x - point.x;
    dy = m_End.y - point.y;
    if( min_dist == 0 )
    {
        if( (dx == 0) && (dy == 0 ) )
            result |= ENDPOINT;
    }
    else
    {
        double dist = ( (double) dx * dx ) + ( (double) dy * dy );
        dist = sqrt( dist );
        if( min_dist >= (int) dist )
            result |= ENDPOINT;
    }

    return result;
}


EDA_Rect TRACK::GetBoundingBox() const
{
    // end of track is round, this is its radius, rounded up
    int radius = ( m_Width + 1 ) / 2;

    int ymax;
    int xmax;

    int ymin;
    int xmin;

    if( Type() == TYPE_VIA )
    {
        // Because vias are sometimes drawn larger than their m_Width would
        // provide, erasing them using a dirty rect must also compensate for this
        // possibility (that the via is larger on screen than its m_Width would provide).
        // Because it is cheap to return a larger BoundingBox, do it so that
        // the via gets erased properly.  Do not divide width by 2 for this reason.
        radius = m_Width;

        ymax = m_Start.y;
        xmax = m_Start.x;

        ymin = m_Start.y;
        xmin = m_Start.x;
    }
    else
    {
        radius = ( m_Width + 1 ) / 2;

        ymax = MAX( m_Start.y, m_End.y );
        xmax = MAX( m_Start.x, m_End.x );

        ymin = MIN( m_Start.y, m_End.y );
        xmin = MIN( m_Start.x, m_End.x );
    }

    if( ShowClearance( this ) )
    {
        // + 1 is for the clearance line itself.
        radius += GetClearance() + 1;
    }

    ymax += radius;
    xmax += radius;

    ymin -= radius;
    xmin -= radius;

    // return a rectangle which is [pos,dim) in nature.  therefore the +1
    EDA_Rect ret( wxPoint( xmin, ymin ), wxSize( xmax - xmin + 1, ymax - ymin + 1 ) );

    return ret;
}


/**
 * Function Rotate
 * Rotate this object.
 * @param aRotCentre - the rotation point.
 * @param aAngle - the rotation angle in 0.1 degree.
 */
void TRACK::Rotate( const wxPoint& aRotCentre, int aAngle )
{
    RotatePoint( &m_Start, aRotCentre, aAngle );
    RotatePoint( &m_End, aRotCentre, aAngle );
}


/**
 * Function Flip
 * Flip this object, i.e. change the board side for this object
 * @param aCentre - the rotation point.
 */
void TRACK::Flip( const wxPoint& aCentre )
{
    m_Start.y = aCentre.y - (m_Start.y - aCentre.y);
    m_End.y   = aCentre.y - (m_End.y - aCentre.y);
    if( Type() == TYPE_VIA )
    {
    }
    else
        SetLayer( ChangeSideNumLayer( GetLayer() ) );
}


// see class_track.h
// SEGVIA and SEGZONE inherit this version
SEARCH_RESULT TRACK::Visit( INSPECTOR* inspector, const void* testData,
                            const KICAD_T scanTypes[] )
{
    KICAD_T stype = *scanTypes;

#if 0 && defined(DEBUG)
    std::cout << GetClass().mb_str() << ' ';
#endif

    // If caller wants to inspect my type
    if( stype == Type() )
    {
        if( SEARCH_QUIT == inspector->Inspect( this, testData ) )
            return SEARCH_QUIT;
    }

    return SEARCH_CONTINUE;
}


/***********************************************/
bool SEGVIA::IsOnLayer( int layer_number ) const
/***********************************************/
{
    int bottom_layer, top_layer;

    ReturnLayerPair( &top_layer, &bottom_layer );

    if( bottom_layer <= layer_number && layer_number <= top_layer )
        return true;
    else
        return false;
}


/***********************************/
int TRACK::ReturnMaskLayer()
/***********************************/
/* Return the mask layer for this.
 *  for a via, there is more than one layer used
 */
{
    if( Type() == TYPE_VIA )
    {
        int via_type = Shape();

        if( via_type == VIA_THROUGH )
            return ALL_CU_LAYERS;

        // VIA_BLIND_BURIED or VIA_MICRVIA:

        int bottom_layer, top_layer;

        // ReturnLayerPair() knows how layers are stored
        ( (SEGVIA*) this )->ReturnLayerPair( &top_layer, &bottom_layer );

        int layermask = 0;
        while( bottom_layer <= top_layer )
        {
            layermask |= g_TabOneLayerMask[bottom_layer++];
        }

        return layermask;
    }
    else
        return g_TabOneLayerMask[m_Layer];
}


/*********************************************************/
void SEGVIA::SetLayerPair( int top_layer, int bottom_layer )
/*********************************************************/

/** Set the .m_Layer member param:
 *  For a via m_Layer contains the 2 layers :
 * top layer and bottom layer used by the via.
 * The via connect all layers from top layer to bottom layer
 * 4 bits for the first layer and 4 next bits for the secaon layer
 * @param top_layer = first layer connected by the via
 * @param bottom_layer = last layer connected by the via
 */
{
    if( Shape() == VIA_THROUGH )
    {
        top_layer    = LAYER_N_FRONT;
        bottom_layer = LAYER_N_BACK;
    }

    if( bottom_layer > top_layer )
        EXCHG( bottom_layer, top_layer );

    m_Layer = (top_layer & 15) + ( (bottom_layer & 15) << 4 );
}


/*********************************************************************/
void SEGVIA::ReturnLayerPair( int* top_layer, int* bottom_layer ) const
/*********************************************************************/

/**
 * Function ReturnLayerPair
 * Return the 2 layers used by  the via (the via actually uses
 * all layers between these 2 layers)
 *  @param top_layer = pointer to the first layer (can be null)
 *  @param bottom_layer = pointer to the last layer (can be null)
 */
{
    int b_layer = LAYER_N_BACK;
    int t_layer = LAYER_N_FRONT;

    if( Shape() != VIA_THROUGH )
    {
        b_layer = (m_Layer >> 4) & 15;
        t_layer = m_Layer & 15;
        if( b_layer > t_layer )
            EXCHG( b_layer, t_layer );
    }

    if( top_layer )
        *top_layer = t_layer;

    if( bottom_layer )
        *bottom_layer = b_layer;
}


/*
 * Function GetBestInsertPoint
 *  Search the "best" insertion point within the track linked list
 *  the best point is the of the corresponding net code section
 *  return the item found in the linked list (or NULL if no track)
 */
TRACK* TRACK::GetBestInsertPoint( BOARD* aPcb )
{
    TRACK* track;

    if( Type() == TYPE_ZONE )
        track = aPcb->m_Zone;
    else
        track = aPcb->m_Track;

    for( ; track;  track = track->Next() )
    {
        if( GetNet() <= track->GetNet() )
            return track;
    }

    return NULL;
}


/*******************************************/
TRACK* TRACK::GetStartNetCode( int NetCode )
/*******************************************/

/* Search (within the track linked list) the first segment matching the netcode
 * ( the linked list is always sorted by net codes )
 */
{
    TRACK* Track = this;
    int    ii    = 0;

    if( NetCode == -1 )
        NetCode = GetNet();

    while( Track != NULL )
    {
        if( Track->GetNet() > NetCode )
            break;

        if( Track->GetNet() == NetCode )
        {
            ii++;
            break;
        }

        Track = (TRACK*) Track->Pnext;
    }

    if( ii )
        return Track;
    else
        return NULL;
}


/*****************************************/
TRACK* TRACK::GetEndNetCode( int NetCode )
/*****************************************/

/* Search (within the track linked list) the last segment matching the netcode
 * ( the linked list is always sorted by net codes )
 */
{
    TRACK* NextS, * Track = this;
    int    ii = 0;

    if( Track == NULL )
        return NULL;

    if( NetCode == -1 )
        NetCode = GetNet();

    while( Track != NULL )
    {
        NextS = (TRACK*) Track->Pnext;
        if( Track->GetNet() == NetCode )
            ii++;

        if( NextS == NULL )
            break;

        if( NextS->GetNet() > NetCode )
            break;

        Track = NextS;
    }

    if( ii )
        return Track;
    else
        return NULL;
}


bool TRACK::Save( FILE* aFile ) const
{
    int type = 0;

    if( Type() == TYPE_VIA )
        type = 1;

    fprintf( aFile, "Po %d %d %d %d %d %d %d\n", m_Shape,
             m_Start.x, m_Start.y, m_End.x, m_End.y, m_Width, m_Drill );

    fprintf( aFile, "De %d %d %d %lX %X\n",
            m_Layer, type, GetNet(),
            m_TimeStamp, ReturnStatus() );

    return true;
}


/*********************************************************************/
void TRACK::Draw( EDA_DRAW_PANEL* panel, wxDC* DC, int draw_mode, const wxPoint& aOffset )
/*********************************************************************/
{
    int l_piste;
    int color;
    int rayon;
    int curr_layer = ( (PCB_SCREEN*) panel->GetScreen() )->m_Active_Layer;

    if( Type() == TYPE_ZONE && DisplayOpt.DisplayZonesMode != 0 )
        return;

    BOARD * brd =  GetBoard( );
    color = brd->GetLayerColor(m_Layer);

    if( brd->IsLayerVisible( m_Layer ) == false && ( color & HIGHLIGHT_FLAG ) !=
        HIGHLIGHT_FLAG )
        return;

    if( DisplayOpt.ContrastModeDisplay )
    {
        if( !IsOnLayer( curr_layer ) )
        {
            color &= ~MASKCOLOR;
            color |= DARKDARKGRAY;
        }
    }

    if( draw_mode & GR_SURBRILL )
    {
        if( draw_mode & GR_AND )
            color &= ~HIGHLIGHT_FLAG;
        else
            color |= HIGHLIGHT_FLAG;
    }

    if( color & HIGHLIGHT_FLAG )
        color = ColorRefs[color & MASKCOLOR].m_LightColor;

    SetAlpha( &color, 150 );

    GRSetDrawMode( DC, draw_mode );


    l_piste = m_Width >> 1;

    if( m_Shape == S_CIRCLE )
    {
        rayon = (int) hypot( (double) ( m_End.x - m_Start.x ),
                             (double) ( m_End.y - m_Start.y ) );

        if( DC->LogicalToDeviceXRel( l_piste ) < L_MIN_DESSIN )
        {
            GRCircle( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                      m_Start.y + aOffset.y, rayon, color );
        }
        else
        {

            if( DC->LogicalToDeviceXRel( l_piste ) <= 1 ) /* Sketch mode if l_piste/zoom <= 1 */
            {
                GRCircle( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                          m_Start.y + aOffset.y, rayon, color );
            }
            else if( ( !DisplayOpt.DisplayPcbTrackFill) || GetState( FORCE_SKETCH ) )
            {
                GRCircle( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                          m_Start.y + aOffset.y, rayon - l_piste, color );
                GRCircle( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                          m_Start.y + aOffset.y, rayon + l_piste, color );
            }
            else
            {
                GRCircle( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                          m_Start.y + aOffset.y, rayon,
                          m_Width, color );
            }
        }
        return;
    }

    if( DC->LogicalToDeviceXRel( l_piste ) < L_MIN_DESSIN )
    {
        GRLine( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                m_Start.y + aOffset.y,
                m_End.x + aOffset.x, m_End.y + aOffset.y, 0, color );
        return;
    }

    if( !DisplayOpt.DisplayPcbTrackFill || GetState( FORCE_SKETCH ) )
    {
        GRCSegm( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                 m_Start.y + aOffset.y,
                 m_End.x + aOffset.x, m_End.y + aOffset.y, m_Width, color );
    }
    else
    {
        GRFillCSegm( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                     m_Start.y + aOffset.y,
                     m_End.x + aOffset.x, m_End.y + aOffset.y, m_Width, color );
    }

    if( panel->GetScreen()->m_IsPrinting )
        return;

    // Show clearance for tracks, not for zone segments
    if( ShowClearance( this ) )
    {
        GRCSegm( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                 m_Start.y + aOffset.y,
                 m_End.x + aOffset.x, m_End.y + aOffset.y,
                 m_Width + (GetClearance() * 2), color );
    }

    /* Display the short netname for tracks, not for zone segments.
     *  we must filter tracks, to avoid a lot of texts.
     *  - only horizontal or vertical tracks are eligible
     *  - only  tracks with a length > 10 * thickness are eligible
     * and, of course, if we are not printing the board
     */
    if( Type() == TYPE_ZONE )
        return;

    if( DisplayOpt.DisplayNetNamesMode == 0 || DisplayOpt.DisplayNetNamesMode == 1 )
        return;

    #define THRESHOLD 10
    if( (m_End.x - m_Start.x) != 0
        &&  (m_End.y - m_Start.y) != 0 )
        return;

    int len = ABS( (m_End.x - m_Start.x)
                   + (m_End.y - m_Start.y) );

    if( len < THRESHOLD * m_Width )
        return;

    if( DC->LogicalToDeviceXRel( m_Width ) < 6 )     // no room to display a text inside track
        return;

    if( GetNet() == 0 )
        return;
    NETINFO_ITEM* net = ( (BOARD*) GetParent() )->FindNet( GetNet() );
    if( net == NULL )
        return;

    int textlen = net->GetShortNetname().Len();
    if( textlen > 0 )
    {
        // calculate a good size for the text
        int     tsize = MIN( m_Width, len / textlen );
        wxPoint tpos  = m_Start + m_End;
        tpos.x /= 2;
        tpos.y /= 2;

        // Calculate angle: if the track segment is vertical, angle = 90 degrees
        int angle = 0;
        if( (m_End.x - m_Start.x) == 0 )    // Vertical segment
            angle = 900;                    // angle is in 0.1 degree

        if( DC->LogicalToDeviceXRel( tsize ) >= 6 )
        {
            if( !(!IsOnLayer( curr_layer )&& DisplayOpt.ContrastModeDisplay) )
            {
                tsize = (tsize * 8) / 10;       // small reduction to give a better look
                DrawGraphicText( panel, DC, tpos,
                                 WHITE, net->GetShortNetname(), angle, wxSize( tsize, tsize ),
                                 GR_TEXT_HJUSTIFY_CENTER, GR_TEXT_VJUSTIFY_CENTER, tsize / 7,
                                 false, false );
            }
        }
    }
}


/*******************************************************************************************/
void SEGVIA::Draw( EDA_DRAW_PANEL* panel, wxDC* DC, int draw_mode, const wxPoint& aOffset )
/*******************************************************************************************/
{
    int color;
    int rayon;
    int curr_layer = ( (PCB_SCREEN*) panel->GetScreen() )->m_Active_Layer;

    int fillvia = 0;
    WinEDA_BasePcbFrame* frame  = (WinEDA_BasePcbFrame*) panel->GetParent();
    PCB_SCREEN*          screen = frame->GetScreen();

    if( frame->m_DisplayViaFill == FILLED )
        fillvia = 1;

    GRSetDrawMode( DC, draw_mode );

    BOARD * brd =  GetBoard( );
    color = brd->GetVisibleElementColor(VIAS_VISIBLE + m_Shape);

    if( brd->IsElementVisible( PCB_VISIBLE(VIAS_VISIBLE + m_Shape) ) == false
        && ( color & HIGHLIGHT_FLAG ) != HIGHLIGHT_FLAG )
        return;

    if( DisplayOpt.ContrastModeDisplay )
    {
        if( !IsOnLayer( curr_layer ) )
        {
            color &= ~MASKCOLOR;
            color |= DARKDARKGRAY;
        }
    }

    if( draw_mode & GR_SURBRILL )
    {
        if( draw_mode & GR_AND )
            color &= ~HIGHLIGHT_FLAG;
        else
            color |= HIGHLIGHT_FLAG;
    }

    if( color & HIGHLIGHT_FLAG )
        color = ColorRefs[color & MASKCOLOR].m_LightColor;

    SetAlpha( &color, 150 );


    rayon = m_Width >> 1;
    // for small via size on screen (rayon < 4 pixels) draw a simplified shape

    int radius_in_pixels = DC->LogicalToDeviceXRel( rayon );

    bool fast_draw = false;

    // Vias are drawn as a filled circle or a double circle. The hole will be drawn later
    int drill_rayon = GetDrillValue() / 2;

    int inner_rayon = rayon - DC->DeviceToLogicalXRel( 2 );

    if( radius_in_pixels < 3 )
    {
        fast_draw = true;
        fillvia = false;
    }

    if( fillvia )
        GRFilledCircle( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                        m_Start.y + aOffset.y, rayon, 0, color, color );

    else
    {
        GRCircle( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                  m_Start.y + aOffset.y, rayon, color );
        if ( fast_draw )
            return;
        GRCircle( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                  m_Start.y + aOffset.y,
                  inner_rayon, color );
    }

    // Draw the via hole if the display option allows it
    if( DisplayOpt.m_DisplayViaMode != VIA_HOLE_NOT_SHOW )
    {
        if( (DisplayOpt.m_DisplayViaMode == ALL_VIA_HOLE_SHOW)          // Display all drill holes requested
           || ( (drill_rayon > 0 ) && !IsDrillDefault() ) )             // Or Display non default holes requested
        {
            if( fillvia )
            {
                bool blackpenstate = false;
                if( screen->m_IsPrinting )
                {
                    blackpenstate = GetGRForceBlackPenState();
                    GRForceBlackPen( false );
                    color = g_DrawBgColor;
                }
                else
                    color = BLACK;     // or DARKGRAY;

                if( draw_mode != GR_XOR )
                    GRSetDrawMode( DC, GR_COPY );
                else
                    GRSetDrawMode( DC, GR_XOR );

                if( DC->LogicalToDeviceXRel( drill_rayon ) > 1 )  // Draw hole if large enough.
                    GRFilledCircle( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                                    m_Start.y + aOffset.y, drill_rayon, 0, color, color );

                if( screen->m_IsPrinting )
                    GRForceBlackPen( blackpenstate );
            }
            else
            {
                if( drill_rayon < inner_rayon )         // We can show the via hole
                    GRCircle( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                              m_Start.y + aOffset.y,
                              drill_rayon, color );
            }
        }
    }

    if( DisplayOpt.ShowTrackClearanceMode == SHOW_CLEARANCE_ALWAYS )
        GRCircle( &panel->m_ClipBox, DC, m_Start.x + aOffset.x,
                  m_Start.y + aOffset.y,
                  rayon + GetClearance(), color );

    // for Micro Vias, draw a partial cross :
    // X on component layer, or + on copper layer
    // (so we can see 2 superimposed microvias ):
    if( Shape() == VIA_MICROVIA )
    {
        int ax, ay, bx, by;

        if( IsOnLayer( LAYER_N_BACK ) )
        {
            ax = rayon; ay = 0;
            bx = drill_rayon; by = 0;
        }
        else
        {
            ax = ay = (rayon * 707) / 1000;
            bx = by = (drill_rayon * 707) / 1000;
        }

        /* lines | or \ */
        GRLine( &panel->m_ClipBox, DC, m_Start.x + aOffset.x - ax,
                m_Start.y + aOffset.y - ay,
                m_Start.x + aOffset.x - bx,
                m_Start.y + aOffset.y - by, 0, color );
        GRLine( &panel->m_ClipBox, DC, m_Start.x + aOffset.x + bx,
                m_Start.y + aOffset.y + by,
                m_Start.x + aOffset.x + ax,
                m_Start.y + aOffset.y + ay, 0, color );

        /* lines - or / */
        GRLine( &panel->m_ClipBox, DC, m_Start.x + aOffset.x + ay,
                m_Start.y + aOffset.y - ax,
                m_Start.x + aOffset.x + by,
                m_Start.y + aOffset.y - bx, 0, color );
        GRLine( &panel->m_ClipBox, DC, m_Start.x + aOffset.x - by,
                m_Start.y + aOffset.y + bx,
                m_Start.x + aOffset.x - ay,
                m_Start.y + aOffset.y + ax, 0, color );
    }

    // for Buried Vias, draw a partial line :
    // orient depending on layer pair
    // (so we can see superimposed buried vias ):
    if( Shape() == VIA_BLIND_BURIED )
    {
        int ax = 0, ay = rayon, bx = 0, by = drill_rayon;
        int layer_top, layer_bottom;

        ( (SEGVIA*) this )->ReturnLayerPair( &layer_top, &layer_bottom );

        /* lines for the top layer */
        RotatePoint( &ax, &ay, layer_top * 3600 / brd->GetCopperLayerCount( ) );
        RotatePoint( &bx, &by, layer_top * 3600 / brd->GetCopperLayerCount( ) );
        GRLine( &panel->m_ClipBox, DC, m_Start.x + aOffset.x - ax,
                m_Start.y + aOffset.y - ay,
                m_Start.x + aOffset.x - bx,
                m_Start.y + aOffset.y - by, 0, color );

        /* lines for the bottom layer */
        ax = 0; ay = rayon; bx = 0; by = drill_rayon;
        RotatePoint( &ax, &ay, layer_bottom * 3600 / brd->GetCopperLayerCount( ) );
        RotatePoint( &bx, &by, layer_bottom * 3600 / brd->GetCopperLayerCount( ) );
        GRLine( &panel->m_ClipBox, DC, m_Start.x + aOffset.x - ax,
                m_Start.y + aOffset.y - ay,
                m_Start.x + aOffset.x - bx,
                m_Start.y + aOffset.y - by, 0, color );
    }

    // Display the short netname:
    if( GetNet() == 0 )
        return;
    if( DisplayOpt.DisplayNetNamesMode == 0 || DisplayOpt.DisplayNetNamesMode == 1 )
        return;
    NETINFO_ITEM* net = ( (BOARD*) GetParent() )->FindNet( GetNet() );
    if( net == NULL )
        return;

    int len = net->GetShortNetname().Len();
    if( len > 0 )
    {
        // calculate a good size for the text
        int tsize = m_Width / len;

        if( DC->LogicalToDeviceXRel( tsize ) >= 6 )
        {
            tsize = (tsize * 8) / 10;           // small reduction to give a better look, inside via
            DrawGraphicText( panel, DC, m_Start,
                             WHITE, net->GetShortNetname(), 0, wxSize( tsize, tsize ),
                             GR_TEXT_HJUSTIFY_CENTER, GR_TEXT_VJUSTIFY_CENTER, tsize / 7,
                             false, false );
        }
    }
}


// see class_track.h
void TRACK::DisplayInfo( EDA_DRAW_FRAME* frame )
{
    wxString msg;
    BOARD*   board = ( (WinEDA_BasePcbFrame*) frame )->GetBoard();

    // Display basic infos
    DisplayInfoBase( frame );

    // Display full track length (in pcbnew)
    if( frame->m_Ident == PCB_FRAME )
    {
        int trackLen = 0;
        Marque_Une_Piste( board, this, NULL, &trackLen, false );
        valeur_param( trackLen, msg );
        frame->AppendMsgPanel( _( "Track Length" ), msg, DARKCYAN );
    }
}


/*
 * Function DisplayInfoBase
 * has knowledge about the frame and how and where to put status information
 * about this object into the frame's message panel.
 * Display info about the track segment only, and does not calculate the full track length
 * @param frame A EDA_DRAW_FRAME in which to print status information.
 */
void TRACK::DisplayInfoBase( EDA_DRAW_FRAME* frame )
{
    wxString msg;
    BOARD*   board = ( (WinEDA_BasePcbFrame*) frame )->GetBoard();

    frame->ClearMsgPanel();

    switch( Type() )
    {
    case TYPE_VIA:
        msg = g_ViaType_Name[Shape()];
        break;

    case TYPE_TRACK:
        msg = _( "Track" );
        break;

    case TYPE_ZONE:
        msg = _( "Zone" ); break;

    default:
        msg = wxT( "????" ); break;
    }

    frame->AppendMsgPanel( _( "Type" ), msg, DARKCYAN );

    // Display Net Name (in pcbnew)
    if( frame->m_Ident == PCB_FRAME )
    {
        NETINFO_ITEM* net = board->FindNet( GetNet() );

        if( net )
            msg = net->GetNetname();
        else
            msg = wxT( "<noname>" );

        frame->AppendMsgPanel( _( "NetName" ), msg, RED );

        /* Display net code : (usefull in test or debug) */
        msg.Printf( wxT( "%d .%d" ), GetNet(), GetSubNet() );
        frame->AppendMsgPanel( _( "NetCode" ), msg, RED );
    }

#if defined(DEBUG)

    /* Display the flags */
    msg.Printf( wxT( "0x%08X" ), m_Flags );
    frame->AppendMsgPanel( _( "Flags" ), msg, BLUE );

#endif

    /* Display the State member */
    msg = wxT( ". . " );
    if( GetState( TRACK_LOCKED ) )
        msg[0] = 'F';

    if( GetState( TRACK_AR ) )
        msg[2] = 'A';

    frame->AppendMsgPanel( _( "Status" ), msg, MAGENTA );

    /* Display layer or layer pair) */
    if( Type() == TYPE_VIA )
    {
        SEGVIA* Via = (SEGVIA*) this;
        int     top_layer, bottom_layer;

        Via->ReturnLayerPair( &top_layer, &bottom_layer );
        msg = board->GetLayerName( top_layer ) + wxT( "/" )
              + board->GetLayerName( bottom_layer );
    }
    else
        msg = board->GetLayerName( m_Layer );

    frame->AppendMsgPanel( _( "Layer" ), msg, BROWN );

    /* Display width */
    valeur_param( (unsigned) m_Width, msg );

    if( Type() == TYPE_VIA )      // Display Diam and Drill values
    {
        // Display diameter value:
        frame->AppendMsgPanel( _( "Diam" ), msg, DARKCYAN );

        // Display drill value
        int drill_value = GetDrillValue();

        valeur_param( (unsigned) drill_value, msg );

        wxString title = _( "Drill" );
        title += wxT( " " );

        if( m_Drill >= 0 )
            title += _( "(Specific)" );
        else
            title += _( "(Default)" );

        frame->AppendMsgPanel( title, msg, RED );
    }
    else
    {
        frame->AppendMsgPanel( _( "Width" ), msg, DARKCYAN );
    }

    NETCLASS* netclass = GetNetClass();
    if( netclass )
    {
        msg = netclass->GetName();
        frame->AppendMsgPanel( _( "Net Class" ), msg, DARKCYAN );
    }

    // Display segment length
    if( Type() != TYPE_VIA )      // Display Diam and Drill values
    {
        valeur_param( wxRound( GetLength() ), msg );
        frame->AppendMsgPanel( _( "Segment Length" ), msg, DARKCYAN );
    }
}


/**
 * Function HitTest
 * tests if the given wxPoint is within the bounds of this object.
 * @param refPos A wxPoint to test
 * @return bool - true if a hit, else false
 */
bool TRACK::HitTest( const wxPoint& refPos )
{
    int radius = m_Width >> 1;

    // (dx, dy) is a vector from m_Start to m_End (an origin of m_Start)
    int dx = m_End.x - m_Start.x;
    int dy = m_End.y - m_Start.y;

    // (spot_cX, spot_cY) is a vector from m_Start to ref_pos (an origin of m_Start)
    int spot_cX = refPos.x - m_Start.x;
    int spot_cY = refPos.y - m_Start.y;

    if( Type() == TYPE_VIA )
    {
        return (double) spot_cX * spot_cX + (double) spot_cY * spot_cY <=
               (double) radius * radius;
    }
    else
    {
        if( DistanceTest( radius, dx, dy, spot_cX, spot_cY ) )
            return true;
    }

    return false;
}


/**
 * Function HitTest (overlaid)
 * tests if the given EDA_Rect intersect this object.
 * For now, an ending point must be inside this rect.
 * @param refArea an EDA_Rect to test
 * @return bool - true if a hit, else false
 */
bool TRACK::HitTest( EDA_Rect& refArea )
{
    if( refArea.Contains( m_Start ) )
        return true;
    if( refArea.Contains( m_End ) )
        return true;
    return false;
}


#if defined(DEBUG)

/**
 * Function Show
 * is used to output the object tree, currently for debugging only.
 * @param nestLevel An aid to prettier tree indenting, and is the level
 *          of nesting of this object within the overall tree.
 * @param os The ostream& to output to.
 */
void TRACK::Show( int nestLevel, std::ostream& os )
{
    NestedSpace( nestLevel, os ) << '<' << GetClass().Lower().mb_str() <<

//        " shape=\""     << m_Shape      << '"' <<
    " addr=\"" << std::hex << this << std::dec << '"' <<
    " layer=\"" << m_Layer << '"' <<
    " width=\"" << m_Width << '"' <<
    " flags=\"" << m_Flags << '"' <<
    " status=\"" << GetState( -1 ) << '"' <<

//        " drill=\""     << GetDrillValue()   << '"' <<
    " netcode=\"" << GetNet() << "\">" <<
    "<start" << m_Start << "/>" <<
    "<end" << m_End << "/>";

    os << "</" << GetClass().Lower().mb_str() << ">\n";
}


/**
 * Function Show
 * is used to output the object tree, currently for debugging only.
 * @param nestLevel An aid to prettier tree indenting, and is the level
 *          of nesting of this object within the overall tree.
 * @param os The ostream& to output to.
 */
void SEGVIA::Show( int nestLevel, std::ostream& os )
{
    const char* cp;

    switch( Shape() )
    {
    case VIA_THROUGH:
        cp = "through";
        break;

    case VIA_BLIND_BURIED:
        cp = "blind/buried";
        break;

    case VIA_MICROVIA:
        cp = "micro via";
        break;

    default:
    case VIA_NOT_DEFINED:
        cp = "undefined";
        break;
    }

    int    topLayer;
    int    botLayer;
    BOARD* board = (BOARD*) m_Parent;


    ReturnLayerPair( &topLayer, &botLayer );

    NestedSpace( nestLevel, os ) << '<' << GetClass().Lower().mb_str() <<
    " type=\"" << cp << '"';

    if( board )
        os << " layers=\"" << board->GetLayerName( topLayer ).Trim().mb_str() << ","
           << board->GetLayerName( botLayer ).Trim().mb_str() << '"';
    os <<
    " width=\"" << m_Width << '"' <<
    " drill=\"" << GetDrillValue() << '"' <<
    " netcode=\"" << GetNet() << "\">" <<
    "<pos" << m_Start << "/>";

    os << "</" << GetClass().Lower().mb_str() << ">\n";
}


wxString TRACK::ShowState( int stateBits )
{
    wxString ret;

    if( stateBits & IS_LINKED )
        ret << wxT( " | IS_LINKED" );
    if( stateBits & TRACK_AR )
        ret << wxT( " | TRACK_AR" );
    if( stateBits & TRACK_LOCKED )
        ret << wxT( " | TRACK_LOCKED" );
    if( stateBits & IN_EDIT )
        ret << wxT( " | IN_EDIT" );
    if( stateBits & IS_DRAGGED )
        ret << wxT( " | IS_DRAGGED" );
    if( stateBits & DO_NOT_DRAW )
        ret << wxT( " | DO_NOT_DRAW" );
    if( stateBits & IS_DELETED )
        ret << wxT( " | IS_DELETED" );
    if( stateBits & BUSY )
        ret << wxT( " | BUSY" );
    if( stateBits & END_ONPAD )
        ret << wxT( " | END_ONPAD" );
    if( stateBits & BEGIN_ONPAD )
        ret << wxT( " | BEGIN_ONPAD" );
    if( stateBits & FLAG0 )
        ret << wxT( " | FLAG0" );
    if( stateBits & FLAG1 )
        ret << wxT( " | FLAG1" );

    return ret;
}


#endif